INTERPARTICLE COLLISIONS DRIVEN BY ULTRASOUND
INTERPARTICLE COLLISIONS DRIVEN BY ULTRASOUND
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DOI：
10.1126/science.2309118
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发表时间：
1990-03-02
期刊：
影响因子：
56.9
通讯作者：
SUSLICK, KS
中科院分区：
文献类型：
--
作者：
DOKTYCZ, SJ;SUSLICK, KS
超声波已成为液-固化学反应中的一种重要合成工具，但观察到的增强作用的起源仍然未知。研究了高强度超声波对固-液浆体的影响。发现由声空化产生的湍流和冲击波以足够高的速度将金属颗粒驱动在一起以在碰撞时引起熔化。一系列过渡金属粉末被用来探测在这种粒子间碰撞过程中达到的最高温度和速度。在碳氢化合物液体中用超声波辐照的金属颗粒以大约一半音速进行碰撞，并在平均直径为10 μm的颗粒的撞击点产生2600°C至3400°C的局部有效温度。
Ultrasound has become an important synthetic tool in liquid-solid chemical reactions, but the origins of the observed enhancements remained unknown. The effects of high-intensity ultrasound on solid-liquid slurries were examined. Turbulent flow and shock waves produced by acoustic cavitation were found to drive metal particles together at sufficiently high velocities to induce melting upon collision. A series of transition-metal powders were used to probe the maximum temperatures and speeds reached during such interparticle collisions. Metal particles that were irradiated in hydrocarbon liquids with ultrasound underwent collisions at roughly half the speed of sound and generated localized effective temperatures between 2600°C and 3400°C at the point of impact for particles with an average diameter of ∼10 μm.